Priorities of R, S Conventions
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• How many possible trisubstituted derivatives C6H3X2Y can be btained from the meta disubstituted benzene C6H4X2? (Ignore directive effects of the substituents X and assume that all positions on the ring are accessible to the reagent Y+).
1. One 2. Two 3. Three 4. four
• In assigning priorities according to R,S convention, which group ranks highest?
1. -CH2(CH2)10CH3
2. -CH(CH3)2
3. -C(CH3)3
4. -CH2Cl
5. -CH2(CH2)10Cl
• Which of the following compounds reacts with cyclopentanone to yield and amine?
1. NaNH2
2. (CH3)2CHNH2
3. (CH3)3N
4. (CH3)2NH
• In a strongly acidic solution the amino acid lysine exists as the dication:
+
H3N(CH2)4CHOOH
+
NH3
As the pH is raised what monocation is formed from the loss of the proton from the dication?
O
1. H2N(CH2)4CHC OH
+ NH3
2.
O
+
H3N(CH2)4C OH
NH2
3.
O
+
H3N(CH2)4C OH-
+NH3
4.
O
+
H3N(CH2)4C OH
+NH3
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Solution Summary
Priorities of R, S conventions are examined.
Solution Preview
1.
2.
"3" is a one-step reaction. It proceeds via an SN2 reaction.
3.
"2" is the strongest. The F group is ...
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